S
srini4vasan
Hi,
I wrote a small socket program in C++ using unix machine.
Compiler CC.
It is asking some library file or linker file
Could you please send the library files or linker files for following
program.
error:
$ CC server_socket.cpp -lsocket -lm -lc -lrt
Undefined first referenced
symbol in file
int unlink(const char*) server_socket.o
int close(int) server_socket.o
--------------------------------------------------------------------------------
$CC client_socket.cpp -lsocket -lm -lc -lrt
Undefined first referenced
symbol in file
int close(int) client_socket.o
---------------------------------------------------------------------------------
Program:
-----------------
server: server_socket.cpp
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#define SOCK_PATH "echo_socket"
int main(void)
{
int s, s2, t, len;
struct sockaddr_un local, remote;
char str[100];
int unlink(const char *path);
int close(int);
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
local.sun_family = AF_UNIX;
strcpy(local.sun_path, SOCK_PATH);
unlink(local.sun_path);
len = strlen(local.sun_path) + sizeof(local.sun_family);
if (bind(s, (struct sockaddr *)&local, len) == -1) {
perror("bind");
exit(1);
}
if (listen(s, 5) == -1) {
perror("listen");
exit(1);
}
for(; {
int done, n;
printf("Waiting for a connection...\n");
t = sizeof(remote);
if ((s2 = accept(s, (struct sockaddr *)&remote, &t)) ==
-1) {
perror("accept");
exit(1);
}
printf("Connected.\n");
done = 0;
do {
n = recv(s2, str, 100, 0);
if (n <= 0) {
if (n < 0) perror("recv");
done = 1;
}
if (!done)
if (send(s2, str, n, 0) < 0) {
perror("send");
done = 1;
}
} while (!done);
close(s2);
}
return 0;
}
---------------------------------------------------------------------------------------------------------------------------
client: client_socket.cpp
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#define SOCK_PATH "echo_socket"
int main(void)
{
int s, t, len;
struct sockaddr_un remote;
char str[100];
int close(int a);
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
printf("Trying to connect...\n");
remote.sun_family = AF_UNIX;
strcpy(remote.sun_path, SOCK_PATH);
len = strlen(remote.sun_path) + sizeof(remote.sun_family);
if (connect(s, (struct sockaddr *)&remote, len) == -1) {
perror("connect");
exit(1);
}
printf("Connected.\n");
while(printf("> "), fgets(str, 100, stdin), !feof(stdin)) {
if (send(s, str, strlen(str), 0) == -1) {
perror("send");
exit(1);
}
if ((t=recv(s, str, 100, 0)) > 0) {
str[t] = '\0';
printf("echo> %s", str);
} else {
if (t < 0) perror("recv");
else printf("Server closed connection\n");
exit(1);
}
}
close(s);
return 0;
}
-------------------------------------------------------------------------------
Please send me the linker file for close() and unlink()
I wrote a small socket program in C++ using unix machine.
Compiler CC.
It is asking some library file or linker file
Could you please send the library files or linker files for following
program.
error:
$ CC server_socket.cpp -lsocket -lm -lc -lrt
Undefined first referenced
symbol in file
int unlink(const char*) server_socket.o
int close(int) server_socket.o
--------------------------------------------------------------------------------
$CC client_socket.cpp -lsocket -lm -lc -lrt
Undefined first referenced
symbol in file
int close(int) client_socket.o
---------------------------------------------------------------------------------
Program:
-----------------
server: server_socket.cpp
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#define SOCK_PATH "echo_socket"
int main(void)
{
int s, s2, t, len;
struct sockaddr_un local, remote;
char str[100];
int unlink(const char *path);
int close(int);
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
local.sun_family = AF_UNIX;
strcpy(local.sun_path, SOCK_PATH);
unlink(local.sun_path);
len = strlen(local.sun_path) + sizeof(local.sun_family);
if (bind(s, (struct sockaddr *)&local, len) == -1) {
perror("bind");
exit(1);
}
if (listen(s, 5) == -1) {
perror("listen");
exit(1);
}
for(; {
int done, n;
printf("Waiting for a connection...\n");
t = sizeof(remote);
if ((s2 = accept(s, (struct sockaddr *)&remote, &t)) ==
-1) {
perror("accept");
exit(1);
}
printf("Connected.\n");
done = 0;
do {
n = recv(s2, str, 100, 0);
if (n <= 0) {
if (n < 0) perror("recv");
done = 1;
}
if (!done)
if (send(s2, str, n, 0) < 0) {
perror("send");
done = 1;
}
} while (!done);
close(s2);
}
return 0;
}
---------------------------------------------------------------------------------------------------------------------------
client: client_socket.cpp
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#define SOCK_PATH "echo_socket"
int main(void)
{
int s, t, len;
struct sockaddr_un remote;
char str[100];
int close(int a);
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
printf("Trying to connect...\n");
remote.sun_family = AF_UNIX;
strcpy(remote.sun_path, SOCK_PATH);
len = strlen(remote.sun_path) + sizeof(remote.sun_family);
if (connect(s, (struct sockaddr *)&remote, len) == -1) {
perror("connect");
exit(1);
}
printf("Connected.\n");
while(printf("> "), fgets(str, 100, stdin), !feof(stdin)) {
if (send(s, str, strlen(str), 0) == -1) {
perror("send");
exit(1);
}
if ((t=recv(s, str, 100, 0)) > 0) {
str[t] = '\0';
printf("echo> %s", str);
} else {
if (t < 0) perror("recv");
else printf("Server closed connection\n");
exit(1);
}
}
close(s);
return 0;
}
-------------------------------------------------------------------------------
Please send me the linker file for close() and unlink()